Where can I get 9" Rear End?

I've currently got an 8" rear end in my 1966 Mustang, and I'm putting a new engine in making over 300hp and everyone has been telling me to get a 9" rear end. I was wondering if anyone could give me a ball park of how much it is gonna cost for a 9". I was also wondering if anyone had links to websites that sell 9" rear ends that are already rebuilt and ready to go right into a 1966 Mustang.
Thanks
 
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You don't need to upgrade with only 300 Flywheel HP period.

You don't need to upgrade with only 300 rear wheel HP unless you are going to run slicks.

The 8 inch can take that power level ok, and you will save yourself the additional parasidic loss. Of course you will spend a little more on gears and locking setups, but it will still be cheaper than converting to a 9 inch setup.

If you still want to upgrade and are tight on money, 57-9 Ford 9 inch housing are a direct bolt in (I run one in my 65).